Plants may alter competition by modifying nutrient bioavailability in rhizosphere: a modeling approach

Abstract : Plants modify nutrient availability by releasing chemicals in rhizosphere. This change in availability induced by roots (bioavailability) is known to improve nutrient uptake by individual plants releasing such compounds. Can this bioavailability alter plant competition for nutrients and under what conditions? To address these questions, we have developed a model of nutrient competition between plant species based on mechanistic descriptions of nutrient diffusion, plant exudation and plant uptake. The model was parametrized using data of the effects of root citrate exudation on phosphorus availability. We performed a sensitivity analysis for key parameters to test the generality of these effects. Our simulations suggest that: 1) Nutrient uptake depends on the number of roots when nutrients and exudates diffuse little, because individual roots are nearly independent in terms of nutrient supply. In this case, bioavailability profits only species with exudates. 2) Competition for nutrients depends on the spatial arrangement of roots when nutrients diffuse little, but exudates diffuse widely. 3) Competition for nutrients depends on the nutrient uptake capacity of roots when nutrients and exudates diffuse widely. In this case, bioavailability profits all species. Mechanisms controlling competition for bioavailable nutrients appear to be diverse and strongly depend on soil, nutrient and plant properties.
Type de document :
Article dans une revue
The American Naturalist, The American Society of Naturalists, 2008, 171 (1), pp.44-58
Liste complète des métadonnées

Littérature citée [47 références]  Voir  Masquer  Télécharger

https://hal-bioemco.ccsd.cnrs.fr/bioemco-00167407
Contributeur : Xavier Raynaud <>
Soumis le : mardi 10 mars 2009 - 07:00:03
Dernière modification le : mardi 24 avril 2018 - 17:20:12
Document(s) archivé(s) le : vendredi 9 avril 2010 - 00:59:50

Fichier

RJL08.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

  • HAL Id : bioemco-00167407, version 1

Collections

Citation

Xavier Raynaud, Benoit Jaillard, Paul Leadley. Plants may alter competition by modifying nutrient bioavailability in rhizosphere: a modeling approach. The American Naturalist, The American Society of Naturalists, 2008, 171 (1), pp.44-58. 〈bioemco-00167407〉

Partager

Métriques

Consultations de la notice

537

Téléchargements de fichiers

889